1. Tira G, Shahzada KA, Physiology of nose and paranasal sinuses; scott brown 8th edition, pp 983–988
2. Negus VE (1952) Humidification of the air passages. Thorax 7(2):148–151
3. WHO Director-General's opening remarks at the media briefing on COVID-19. 11 March 2020
4. https://www.who.int/emergencies/diseases/novel-coronavirus-2019.Accessed 12th august 2020
5. https://www.mohfw.gov.in/ accessed 13th august 2020